Rotor for magneto electric generator



June 13, 1939. LE ROY s. DUNHAM Er AL 2,161,953

KOTOR FOR MAGNETO ELECTRIC GENERATOR Filed March l2, 1957 Ai "F2 [NVDVTORS le. fo Dan/y 36 37 iff/w55 Roba-A5222 ZT l 'y ATTORN y Patented .im i3, lacs 2,161,953

UNITED STATES 4PATENT ori-lcs ROTDB FOB MAGNET() ELECTRIC GENERATOR Le lo! 8. Dunham, East Orange and Arthur F.

Robertson. Belleville, N. J., assignors to Edison- Splitdorf Corporation, West Orange, N. J., a corporation of New Jersey animan umn lz, 1m. sensi No. 130.496

s claim. (ci. 11i-zn) Ihis invention relates to the construction of a too greatly even at the axis, else too little magrotor for a magneto electric generator such as is net material will be left. It should be noted used for furnishing ignition current for internal that it is customary for the shaft ends to be of combustion engines. In our application Serial standard size, regardless of the rotor size. in

5 No. 26,600, died June 14, 1935, now Patent order to fit other external fittings of standard s 2.001.000, imued May 25, i937, we have shown sise. and described a-special type of magneto, in which Our invention will be best understood by refthe rotor includes a permanent magnet made out erence to-the annexed drawing wherein: of a strongly magnetic material such as an al- Figure 1 is a sectional view through the rotor |010! containing nickel, aluminum. iron, and someand shaft ends attached thereto. i0 times cobalt. However, the exact composition Figure 2 is a view on the line 2-2 of Figure i. of the magnetic material is not the important Figure 3 is an elevational view of the rotor point and vve are familiar with other suitable shown in Figures l and 2. magnetic materials, such as strongly magnetic Figure 4 is a view similar to Figure l but showsteell alloys. mixtures of powdered oxides coming a modified method of attaching the shaft I6 pressed and bound together. and other relatively ends to the magnet.

new permanent magnet composition. A rotor Figure 5 is a view similar to Figure 4 but of a composedofthessmaterlalsisusuailycastina furthermodiiiedform. suitable mould, but some of the materials may Figure 6 is an end view of Figure'. .beusediniineiydividedformandcompressed FigurelisaviewsimilartoFigureibutofam A modified form of construction. the axial center of the magnet in order to at- Figure il is an end view of the right-hand end adoubiepurpose;iirst.toprovideforthe ofFigure'I.

on of a through shaft assembly, and sec- Figure 0 is a view similar to Figure? but showto eoonomise on the magnetic material at ing a slightly modified construction. v u

central neutral point. Furthermore, the Figure 10- is an end view of Figure 9.

magnetispreferablycastinsuchaway FlgureliisaviewsimilartoFlgurebut to avoid as far as possible all machine work mowing a further modification. thereon because the magnet after beim com- Figure 12 is a view .of the right-hand end of .pletedissohardastopreventordinarymachine Figuren.

operations thereon, grinding being the only sat- Figure i3 is a sectional view of a construction Vbfactorywaysofarfoundrifoperatingons somewhatsimilartoFigurelbutshowingcermagnet nude of these materials. tain pole pieces added to the rotor magnet. In our patent heretofore referred to, we have Figure 14 is an end view of Figure 13, and

one or more means for attaching shaft Figure 15 is a diagrammatic view of a magneto 35 'a magnet of this type. It is an system utilising the rotor of our construction. t invention to provide other In the various views wherein like numbers 'satisfactory means of makina l rotor including refer to corresponding parts, l is a permanent a magnet and its associated shaft or shaft ends magnet made of the material hereinbefore defor this type of magnet. scribed. having a hole 2 therethrough to receive o It is another obiect of our present, invention a shaft member s which is threaded at both to provide other means of'constnscting a rotor ends. The magnet i has hubs l and l extendatih embodying a through shaft construction ing therefrom s o that in assembly of the magnet. t members. either as integral to the shaft ends 0 and 1, the only machine work an assembled group, traverse the requiredisthe grinding of the end faces of the 5 end.` hubs I and I to get a smooth surface for the Itisasdilfurtheroblectof-thisinventionto ngeslandi. Iheshaftendsiandlarel provide other means for constructing rotors ofA provided with annular projections il and ii med in many magnetos, which. which extend within the hole 2 and preferably ving a through shaft, have magnetswith engaging the inner periphery of the hole so as w an axial hole smaller in diameter than the dito give a better support for the ends of the mag- 'ameteroftbeabaftenensiona Whileeconcmy net-ionthe shaft endslandlwhich are ofmagneticmaterialattheaxisgwhichismagscrewedupashardaspossibleontothethreaded netieallymoreorlessneutrai,ganbeachieved endsoftheshaftmemberlafterwhichoneor `lto'suniedreesrnallrotor'snnotberohhed moreportionsiIoftheilangeslandtareindented into the respective recesses I3 in the hubs 4 and 5 thereby locking the shaft ends securely in position to prevent any relative rotary movement between the shaft ends and the magnet I.

In Figure 4 one of the shaft ends, for example 1, has the shaft member 3 integral therewith, while the other end is threaded to receive the other shaft end. for example 6. The flanges 8 and 9 are locked to the hubs 4 and 5 the same as in Figures l to 3.

In Figure 5, the shaft ends 6 and 1 are attached to the shaft member 3 as in Figure l but the magnet I has its end faces I4 and I5 formed or ground to a flat face to receive the flanges 8 and 9. In this case a recess I6 is cast or formed directly in the end faces I4 and I5 and a portion I1 of each of the flanges 8 and 9 is forced into this recess as shown in Figure 6.

In Figure 7 the magnet I has end faces I4 and I5 the same as in Figure 5 but these faces arc provided with recesses which may be circular or polygonal in shape as they need not be ground to receive the flanges 8 and 9 of the shaft ends 6 and 1. In this case the shaft member 3 is integral with the member 1 as in Figure 4 but instead of the opposite end being threaded its knurls IB or the equivalent are forced into the shaft end 6 after which a pin I9 is passed through the shaft end 6 and the knurled part I8 of the shaft member 3. Both the flanges 8 and 9 are upset into the recesses provided. The flanges 8 and 9 may be circular or polygonal in shape but ln either case the upsetting operation positively prevents relative rotary movement between the magnet I and the shaft end.

In Figure 9 the magnet I is shown with the shaft member 3 of approximately the same size as the hole in the magnet, the flange 8 engaging the end face I4 while the end face I5 of the magnet is provided with a recess 20 to receive a lug 2| integral with a lock washer 22 held in place by a member 23 forced onto the knurled portion 24 of the shaft end 1, a pin 25 being used to anchor the member 23 to the shaft end 1.

In Figure 11 the construction is quite similar to that shown in Figure 9 except the shaft end 1 is threaded at 26 to receive a nut 21, a pin 25 going through the nut 21 and the shaft end 1 being used to hold the nut securely in place. In place of the pin 25 the washer 22 may have a lug 28 bent over the nut after the same has been turned to full locking position.

In Figure 13 the poles of the magnet I are provided with laminated pole pieces 29 and 30 which are preferably dove-tailed thereon and held between the end plates 3| and 32 by means of rivets 33 or the like. The shaft ends 6 and 1 are fastened together somewhat as shown in Figure 5. However, in Figure 13 the recesses I6 are in the end plates and the portions I1 of the flanges 8 and 9 are forced into these recesses after the shaft ends 6 and 1 have been turned to locking position.

In all of these figuresy the magnet shown is of a two-pole type having spaced recesses 34 and 35 forming the poles of the magnet, but it is to be understood that the magnet I may be constructed with a plurality of pairs of poles and that the localization of magnetism at useful poles may be arrived at by any suitable means other than the spaced recesses 34 and 35 which are cast therein. However, when a two-pole magnet is used the Ystationary system is preferably of the type as illustrated in Figure 15 in which the pole pieces 36 and 31 carry a stationary coil 38 having a core 39 in cooperative relationship with the pole pieces 38 and 31.

From what has been said it will be understood that certain details may be varied without departing from the spirit of our invention or the scope of the appended claims.

What we claim is:

l. In a magneto electric generator having a relatively stationary system including a coil and members of magnetic material for gathering and sending flux therethrough; a rotary permanent magnet for supplying magnetic flux to said system, said magnet having a centrally located hole therethrough, said magnet having formations at each end to be engaged by shaft parts, and shaft parts having portions extending into the hole in the magnet and engaging the inner periphery of said hole, means for anchoring said shaft parts to said magnet end formations and a stud for connecting said shaft parts located in said magnet hole and having a diameter smaller than said shaft part portions which are located in the hole.

2. In a magneto electric generator having a relatively stationary system including a coil and members of magnetic material for gathering and sending flux therethrough; a rotary permanent magnet for supplying magnetic flux to said system, said magnet having a centrally located hole therethrough, said magnet being made with formations at each end to be engaged by shaft parts, and shaft parts engaging said formations, a member extending through the hole and serving to connect said shaft parts together, said shaft parts having portions extending into the hole and engaging the inner periphery thereof, and means for anchoring said shaft parts to said magnet end formations to prevent relative rotation therebetween.

3. A magneto rotor construction as set forth in claim 2, further characterized in that said member extending through the hole in the magnet is integral with one shaft part, While the other end is provided with means for attachment to the other shaft part.

4. In a magneto electric generator having a relatively stationary system including a coil and members of magnetic material for gathering and sending flux therethrough; a rotary permanent magnet for supplying magnetic ux to said system, said magnet having a centrally located hole therethrough, said magnet being made at both ends with recesses extending toward each other and located inside the end faces of the magnet, shaft ends having portions forced into said recesses to securely anchor the magnet to the shaft ends and rigid connecting means joining said shaft ends through said magnet hole.

5. A magneto rotor structure as set forth in claim 4, further characterized in that one shaft end is reduced in diameter and this reduced end extends through the hole in the magnet and into the other shaft end and is fastened thereto.

6. In a magneto electric generator having a relatively stationary system including a coil and members of magnetic material for gathering and sending flux therethrough; a rotary permanent magnet for supplying magnetic flux to said systern, said magnet having a centrally located hole therethrough and having spaced recesses forming poles, said magnet being made with substantially flat end faces at both ends and extending the full diameter of the magnet, and a shaft member going through the hole and having means for directly gripping the magnet on both faces, in-

cluding means to prevent relative turning between the magnet and shaft members.

7. In a magneto electric generator having a relatively stationary system including a coil and members of magnetic material for gathering and sending iiux therethrough; a. rotary permanent magnet for supplying magnetic flux to said system, said magnet having a centrally located hole therethrough. said magnet being made with hubs at each end with at least one recess therein, a stud located in said hole and threaded at both ends, and a stub shaft screwed to each end of the stud and having a portion engaging its cooperative magnet hub, and a further portion entering the hole in the magnet and engaging the inner periphery of said hole, a part of said hubengaging portion being indented into its hub recess to prevent relative rotary motion between the magnet and the shaft end.

8. A magneto rotor construction as set forth in claim 3, further characterized in that said member extending through the hole in the magnet is integral with one shaft part, while the other end is threaded and engages a threaded hole in the other shaft part.

9. A magneto rotor construction as set forth in claim l, further characterized in that said anchoring means includes locking recesses in the end of the magnet, and a flange on each shaft part which is deformed into said recess.

LE ROY S. DUNHAM. ARTHUR F. ROBERTSON. 

